I just put a proportionate amount of Seafoam as compared to gas in the tank. That was one of several different uses it had according to the bottle.
I do not believe the plugs are fouled. New plugs were installed when the valve job was done.
Quote:
Originally Posted by mrmad
Senior Member
Join Date: Mar 2007
Location: Temecula, CA
Posts: 159
Rex-O-Saurus
5.39L/100KM
43.64 MPG(US) It is possible your timing belt skipped a tooth on the cam gears? If so, the engine would be running like crap
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I don't think so. The engine runs great at idle (except when it ran low on fuel once) and when driven at a steady speed. In 5th gear I do not notice this problem at all. Only when accelerating or occasionally when traveling in a lower gear does it come up.
Quote:
Originally Posted by landspeed
If it is the fuel filter / something like that, then it won't necessarily give problems at the same RPM all the time. If you rev it in neutral when it is stopped, can you go higher than 4000-5000rpm?.
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Sorry I just now noticed this part of your post quite a while back. In neutral you can go over 4,000 - 5,000 RPM. I have not noticed this problem so much in neutral. It is not always the same RPM, but usually it is in the 4,000 - 5,000 range. Occasionally when it is
really giving me problems I notice it at even 3,000. This is a major problem because this car runs at 2,900 RPM or so at 60 mph in 5th gear. Again I haven't noticed it in 5th gear, but this can be a headache when I only need 4th gear and it rountinely runs at 3k or so.
There are quite a few suggestions here. If I were a bit more mechanically inclined I would try them all out on my own, but since I am not, is there a way that I can try to eliminate them just through simple driving tests? Perhaps I am not being detailed enough in my descriptions? For clairty sake I will go ahead and list all of the ideas (that havent been disproven) below...
1. Strainer/Filtration device on the fuel pump
2. Blocked catalytic converter
3. Valve float
4. Ignition problem of some sort
5. Timing belt skipped a tooth
facts about this car:
1. DOHC with 2 brand new timing belts just recently put on
2. New sparkplugs
3. Had gas sit in it for 4+ - horrible odor when burned (all the bad gas has been used up by now though)
4. When accelerating, normally around 4,000 - 5,000 RPMs the car jerks as though it is not getting enough gas. Will not accelerate further until a higher gear is selected.
5. On extremely bad days it will do it around 3,000 RPMs (typical running rpm for this car)
6. The problem seems to be lessened by adding gas to the tank
7. The problem appears to be augmented when the car is running low on fuel.
8. Once when I ran the tank really really low (to presumably use up all the potential bad fuel) the engine idled extremely low (under 500 rpm) and kept dying on me. I had to gun it up to 4k rpm in neutral and quickly shift to 1st to get it out of the driveway. I coasted through stop signs to avoid stalling out. However after I had driven about 10 miles and warmed the engine up, it idled fine at each stop light I was forced to stop at. Since new gas has been put in, this problem has not come up again.
9. A relay switch somewhere in the ignition system (or perhaps a bad wire) has forced us to reroute the electric signal by connecting a wire to the battery and the solenoid and so the car now has a push buttom system to turn it on. It cranks perfectly fine with this arrangement
10. Brand new starter put on it
Items already tested:
1.) adding seafoam to the tank (further cleaning attempts with seafoam may be in the works)
2.) New fuel filter installed
3.) MAP sensor replaced
4.) Throttle position sensor replaced
5.) Loose wire which somehow connects to the engine block was replaced and reattached
I hope I have collected ideas together well enough. There are so many suggestions... I hope I also filled in the gaps as well. With this information, I am also hoping someone can tell me what potential problem source should be looked into first (whichever appears most likely).